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Title: Myelocyte  
Author: World Heritage Encyclopedia
Language: English
Subject: Leukopoiesis, Haematopoiesis, Chronic myelogenous leukemia, Outline of immunology, Myelomonocyte
Publisher: World Heritage Encyclopedia


Code TH H2.
Anatomical terminology

A myelocyte is a young cell of the granulocytic series, occurring normally in bone marrow (can be found in circulating blood when caused by certain diseases).


  • Histology 1
  • Maturation 2
  • Measurement 3
  • Additional images 4
  • References 5
  • External links 6


When stained with the usual dyes, the cytoplasm is distinctly basophilic and relatively more abundant than in myeloblasts or promyelocytes, even though myelocytes are smaller cells.

Numerous cytoplasmic granules are present in the more mature forms of myelocytes. Neutrophilic and eosinophilic granules are peroxidase-positive, while basophilic granules are not.

The nuclear chromatin is coarser than that observed in myelocyte, but it is relatively faintly stained and lacks a well defined membrane.

The nucleus is fairly regular in contour (not indented), and seems to be 'buried' beneath the numerous cytoplasmic granules. (If the nucleus were indented, it would likely be a metamyelocyte.)


Myelocytes are derived from promyelocytes and give rise to metamyelocytes.


There is an internationally agreed method of counting blasts, with results from M1 upwards.

Additional images


  1. ^ Histology image:01809loa from Vaughan, Deborah (2002). A Learning System in Histology: CD-ROM and Guide.  
  2. ^ Histology image:01810loa from Vaughan, Deborah (2002). A Learning System in Histology: CD-ROM and Guide.  
  3. ^ Histology image:01804loa from Vaughan, Deborah (2002). A Learning System in Histology: CD-ROM and Guide.  

External links

  • Neutrophilic Myelocyte Presented by the University of Virginia
  • Eosinophilic Myelocyte Presented by the University of Virginia
  • Basophilic Myelocyte Presented by the University of Virginia
  • Image at

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